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1991年11月24日,我市某化工厂使用的一台DZL4-13锅炉在正常运行时后管板产生裂纹,当时运行工况为:锅炉运行压力0.45MPa,水位居中。 1 事故现场调查情况该台锅炉的制造完工日期是1990年9月,安装时间为1990年11月,并于当年12月投入运行,主要供生产用汽需要,运行压力不超过0.8MPa,在正常使用时很少停炉。现场调查发现,锅筒后管板右下侧拉撑杆焊缝处出现一条长约50mm、宽近2mm的裂纹(以下称主裂纹),裂纹从焊缝处向管板中延伸,在拉撑杆的外露端靠近主裂纹尖端附近,可辨认出几条细小裂纹,如图
On November 24, 1991, a DZL4-13 boiler used by a chemical plant in our city was cracked on the tube plate after normal operation. Operating conditions at that time were as follows: the boiler operating pressure was 0.45MPa and the water level was at the center. 1 accident scene investigation The boiler manufacturing completion date is September 1990, installation time in November 1990 and put into operation in December of that year, mainly for the production of steam needs, operating pressure does not exceed 0.8MPa, normal Rarely shut down when used. Field survey found that the bottom right of the drum tube plate after the pull rod weld appears a crack of about 50mm, width nearly 2mm (hereinafter referred to as the main crack), the crack from the weld to the tube plate extends in the brace The exposed end of the rod near the main crack near the tip, can identify several small cracks, as shown